uAvionix ping20Si, User And Installation Manual, Page: 29 / 30

UAV-1001626-001 Rev F
ECCN 7A994 Page
29 | 30
A2.2 Mode Message
The mode message indicates the current operating mode. It includes the
current mode, the Ident status, current squawk code setting and
emergency code.
Rate: 1 sec (nominal)
Message Length: 17 bytes
Byte Contents Description
1 ‘^’ ASCII ‘^’ (0x5E)
2 ‘M’ ASCII ‘M’ (0x4D)
3 ‘D’ ASCII ‘D’ (0x44)
4 ‘ ‘ ASCII space (0x20)
5 m See mode field table below
6 ‘,’ ASCII comma (0x2C)
7 ‘I’ See ident field table below
8 ‘,’ ASCII comma (0x2C)
9-12 dddd ASCII squawk code
13 e See emergency field table below
14 h Health bit in hex ASCII “1”
15-16 dd Checksum of bytes 1 through 14. In hex ASCII i.e. “FA”
17 ‘\r’ ASCII carriage return (0x0D)
Mode Field
m Definition ASCII
O OFF 0x4F
A STBY 0x41
C ON 0x43
S ALT 0x53
Ident Field
i Definition ASCII
I Ident Enabled 0x49
- Ident is Inactive 0x2D
Emergency Field
e Definition ASCII
0 None 0x00
1 General 0x01
2 Medical 0x02
3 Fuel 0x03
4 Com 0x04
5 Hijack 0x05
6 Downed 0x06
7 UAS Lost Link 0x07
The health indication is set to ‘1 to indicate that everything is operating
normally.
Example: ^MD A,I,23540120\r
Mode STBY, Ident active, Squawk 2354, No Emergency, Healthy